<template>
    <view>
        <slot v-if="!nodes.length"/>
        <!--#ifdef APP-PLUS-NVUE-->
        <web-view id="_top" ref="web" :style="'margin-top:-2px;height:'+height+'px'" @onPostMessage="_message"/>
        <!--#endif-->
        <!--#ifndef APP-PLUS-NVUE-->
        <view id="_top" :style="showAm+(selectable?';user-select:text;-webkit-user-select:text':'')">
            <!--#ifdef H5 || MP-360-->
            <div :id="'rtf'+uid"></div>
            <!--#endif-->
            <!--#ifndef H5 || MP-360-->
            <trees :lazyLoad="lazyLoad" :loading="loadingImg" :nodes="nodes"/>
            <!--#endif-->
        </view>
        <!--#endif-->
    </view>
</template>

<script>
var search;
// #ifndef H5 || APP-PLUS-NVUE || MP-360
import trees from './libs/trees';

var cache = {},
    // #ifdef MP-WEIXIN || MP-TOUTIAO
    fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null,
    // #endif
    Parser = require('./libs/MpHtmlParser.js');
var dom;

// 计算 cache 的 key
function hash(str) {
    for (var i = str.length, val = 5381; i--;)
        val += (val << 5) + str.charCodeAt(i);
    return val;
}

// #endif
// #ifdef H5 || APP-PLUS-NVUE || MP-360
var {
        windowWidth,
        platform
    } = uni.getSystemInfoSync(),
    cfg = require('./libs/config.js');
// #endif
// #ifdef APP-PLUS-NVUE
var weexDom = weex.requireModule('dom');
// #endif
/**
 * Parser 富文本组件
 * @tutorial https://github.com/jin-yufeng/Parser
 * @property {String} html 富文本数据
 * @property {Boolean} autopause 是否在播放一个视频时自动暂停其他视频
 * @property {Boolean} autoscroll 是否自动给所有表格添加一个滚动层
 * @property {Boolean} autosetTitle 是否自动将 title 标签中的内容设置到页面标题
 * @property {Number} compress 压缩等级
 * @property {String} domain 图片、视频等链接的主域名
 * @property {Boolean} lazyLoad 是否开启图片懒加载
 * @property {String} loadingImg 图片加载完成前的占位图
 * @property {Boolean} selectable 是否开启长按复制
 * @property {Object} tagStyle 标签的默认样式
 * @property {Boolean} showWithAnimation 是否使用渐显动画
 * @property {Boolean} useAnchor 是否使用锚点
 * @property {Boolean} useCache 是否缓存解析结果
 * @event {Function} parse 解析完成事件
 * @event {Function} load dom 加载完成事件
 * @event {Function} ready 所有图片加载完毕事件
 * @event {Function} error 错误事件
 * @event {Function} imgtap 图片点击事件
 * @event {Function} linkpress 链接点击事件
 * @author JinYufeng
 * @version 20201029
 * @listens MIT
 */
export default {
    name: 'parser',
    data() {
        return {
            // #ifdef H5 || MP-360
            uid: this._uid,
            // #endif
            // #ifdef APP-PLUS-NVUE
            height: 1,
            // #endif
            // #ifndef APP-PLUS-NVUE
            showAm: '',
            // #endif
            nodes: []
        }
    },
    // #ifndef H5 || APP-PLUS-NVUE || MP-360
    components: {
        trees
    },
    // #endif
    props: {
        html: String,
        autopause: {
            type: Boolean,
            default: true
        },
        autoscroll: Boolean,
        autosetTitle: {
            type: Boolean,
            default: true
        },
        // #ifndef H5 || APP-PLUS-NVUE || MP-360
        compress: Number,
        loadingImg: String,
        useCache: Boolean,
        // #endif
        domain: String,
        lazyLoad: Boolean,
        selectable: Boolean,
        tagStyle: Object,
        showWithAnimation: Boolean,
        useAnchor: Boolean
    },
    watch: {
        html(html) {
            this.setContent(html);
        }
    },
    created() {
        // 图片数组
        this.imgList = [];
        this.imgList.each = function (f) {
            for (var i = 0, len = this.length; i < len; i++)
                this.setItem(i, f(this[i], i, this));
        }
        this.imgList.setItem = function (i, src) {
            if (i == void 0 || !src) return;
            // #ifndef MP-ALIPAY || APP-PLUS
            // 去重
            if (src.indexOf('http') == 0 && this.includes(src)) {
                var newSrc = src.split('://')[0];
                for (var j = newSrc.length, c; c = src[j]; j++) {
                    if (c == '/' && src[j - 1] != '/' && src[j + 1] != '/') break;
                    newSrc += Math.random() > 0.5 ? c.toUpperCase() : c;
                }
                newSrc += src.substr(j);
                return this[i] = newSrc;
            }
            // #endif
            this[i] = src;
            // 暂存 data src
            if (src.includes('data:image')) {
                var filePath, info = src.match(/data:image\/(\S+?);(\S+?),(.+)/);
                if (!info) return;
                // #ifdef MP-WEIXIN || MP-TOUTIAO
                filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
                fs && fs.writeFile({
                    filePath,
                    data: info[3],
                    encoding: info[2],
                    success: () => this[i] = filePath
                })
                // #endif
                // #ifdef APP-PLUS
                filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`;
                var bitmap = new plus.nativeObj.Bitmap();
                bitmap.loadBase64Data(src, () => {
                    bitmap.save(filePath, {}, () => {
                        bitmap.clear()
                        this[i] = filePath;
                    })
                })
                // #endif
            }
        }
    },
    mounted() {
        // #ifdef H5 || MP-360
        this.document = document.getElementById('rtf' + this._uid);
        // #endif
        // #ifndef H5 || APP-PLUS-NVUE || MP-360
        if (dom) this.document = new dom(this);
        // #endif
        if (search) this.search = args => search(this, args);
        // #ifdef APP-PLUS-NVUE
        this.document = this.$refs.web;
        setTimeout(() => {
            // #endif
            if (this.html) this.setContent(this.html);
            // #ifdef APP-PLUS-NVUE
        }, 30)
        // #endif
    },
    beforeDestroy() {
        // #ifdef H5 || MP-360
        if (this._observer) this._observer.disconnect();
        // #endif
        this.imgList.each(src => {
            // #ifdef APP-PLUS
            if (src && src.includes('_doc')) {
                plus.io.resolveLocalFileSystemURL(src, entry => {
                    entry.remove();
                });
            }
            // #endif
            // #ifdef MP-WEIXIN || MP-TOUTIAO
            if (src && src.includes(uni.env.USER_DATA_PATH))
                fs && fs.unlink({
                    filePath: src
                })
            // #endif
        })
        clearInterval(this._timer);
    },
    methods: {
        // 设置富文本内容
        setContent(html, append) {
            // #ifdef APP-PLUS-NVUE
            if (!html)
                return this.height = 1;
            if (append)
                this.$refs.web.evalJs("var b=document.createElement('div');b.innerHTML='" + html.replace(/'/g, "\\'") +
                    "';document.getElementById('parser').appendChild(b)");
            else {
                html =
                    '<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"><style>html,body{width:100%;height:100%;overflow:hidden}body{margin:0}</style><base href="' +
                    this.domain + '"><div id="parser"' + (this.selectable ? '>' : ' style="user-select:none">') + this._handleHtml(html).replace(/\n/g, '\\n') +
                    '</div><script>"use strict";function e(e){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[e]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}document.body.onclick=function(){e({action:"click"})},' +
                    (this.showWithAnimation ? 'document.body.style.animation="_show .5s",' : '') +
                    'setTimeout(function(){e({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight})},50);\x3c/script>';
                if (platform == 'android') html = html.replace(/%/g, '%25');
                this.$refs.web.evalJs("document.write('" + html.replace(/'/g, "\\'") + "');document.close()");
            }
            this.$refs.web.evalJs(
                'var t=document.getElementsByTagName("title");t.length&&e({action:"getTitle",title:t[0].innerText});for(var o,n=document.getElementsByTagName("style"),r=1;o=n[r++];)o.innerHTML=o.innerHTML.replace(/body/g,"#parser");for(var a,c=document.getElementsByTagName("img"),s=[],i=0==c.length,d=0,l=0,g=0;a=c[l];l++)parseInt(a.style.width||a.getAttribute("width"))>' +
                windowWidth + '&&(a.style.height="auto"),a.onload=function(){++d==c.length&&(i=!0)},a.onerror=function(){++d==c.length&&(i=!0),' + (cfg.errorImg ? 'this.src="' + cfg.errorImg + '",' : '') +
                'e({action:"error",source:"img",target:this})},a.hasAttribute("ignore")||"A"==a.parentElement.nodeName||(a.i=g++,s.push(a.getAttribute("original-src")||a.src||a.getAttribute("data-src")),a.onclick=function(t){t.stopPropagation(),e({action:"preview",img:{i:this.i,src:this.src}})});e({action:"getImgList",imgList:s});for(var u,m=document.getElementsByTagName("a"),f=0;u=m[f];f++)u.onclick=function(m){m.stopPropagation();var t,o=this.getAttribute("href");if("#"==o[0]){var n=document.getElementById(o.substr(1));n&&(t=n.offsetTop)}return e({action:"linkpress",href:o,offset:t}),!1};for(var h,y=document.getElementsByTagName("video"),v=0;h=y[v];v++)h.style.maxWidth="100%",h.onerror=function(){e({action:"error",source:"video",target:this})}' +
                (this.autopause ? ',h.onplay=function(){for(var e,t=0;e=y[t];t++)e!=this&&e.pause()}' : '') +
                ';for(var _,p=document.getElementsByTagName("audio"),w=0;_=p[w];w++)_.onerror=function(){e({action:"error",source:"audio",target:this})};' +
                (this.autoscroll ? 'for(var T,E=document.getElementsByTagName("table"),B=0;T=E[B];B++){var N=document.createElement("div");N.style.overflow="scroll",T.parentNode.replaceChild(N,T),N.appendChild(T)}' : '') +
                'var x=document.getElementById("parser");clearInterval(window.timer),window.timer=setInterval(function(){i&&clearInterval(window.timer),e({action:"ready",ready:i,height:x.scrollHeight})},350)'
            )
            this.nodes = [1];
            // #endif
            // #ifdef H5 || MP-360
            if (!html) {
                if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf);
                return;
            }
            var div = document.createElement('div');
            if (!append) {
                if (this.rtf) this.rtf.parentNode.removeChild(this.rtf);
                this.rtf = div;
            } else {
                if (!this.rtf) this.rtf = div;
                else this.rtf.appendChild(div);
            }
            div.innerHTML = this._handleHtml(html, append);
            for (var styles = this.rtf.getElementsByTagName('style'), i = 0, style; style = styles[i++];) {
                style.innerHTML = style.innerHTML.replace(/body/g, '#rtf' + this._uid);
                style.setAttribute('scoped', 'true');
            }
            // 懒加载
            if (!this._observer && this.lazyLoad && IntersectionObserver) {
                this._observer = new IntersectionObserver(changes => {
                    for (let item, i = 0; item = changes[i++];) {
                        if (item.isIntersecting) {
                            item.target.src = item.target.getAttribute('data-src');
                            item.target.removeAttribute('data-src');
                            this._observer.unobserve(item.target);
                        }
                    }
                }, {
                    rootMargin: '500px 0px 500px 0px'
                })
            }
            var _ts = this;
            // 获取标题
            var title = this.rtf.getElementsByTagName('title');
            if (title.length && this.autosetTitle)
                uni.setNavigationBarTitle({
                    title: title[0].innerText
                })
            // 填充 domain
            var fill = target => {
                var src = target.getAttribute('src');
                if (this.domain && src) {
                    if (src[0] == '/') {
                        if (src[1] == '/')
                            target.src = (this.domain.includes('://') ? this.domain.split('://')[0] : '') + ':' + src;
                        else target.src = this.domain + src;
                    } else if (!src.includes('://') && src.indexOf('data:') != 0) target.src = this.domain + '/' + src;
                }
            }
            // 图片处理
            this.imgList.length = 0;
            var imgs = this.rtf.getElementsByTagName('img');
            for (let i = 0, j = 0, img; img = imgs[i]; i++) {
                if (parseInt(img.style.width || img.getAttribute('width')) > windowWidth)
                    img.style.height = 'auto';
                fill(img);
                if (!img.hasAttribute('ignore') && img.parentElement.nodeName != 'A') {
                    img.i = j++;
                    _ts.imgList.push(img.getAttribute('original-src') || img.src || img.getAttribute('data-src'));
                    img.onclick = function (e) {
                        e.stopPropagation();
                        var preview = true;
                        this.ignore = () => preview = false;
                        _ts.$emit('imgtap', this);
                        if (preview) {
                            uni.previewImage({
                                current: this.i,
                                urls: _ts.imgList
                            });
                        }
                    }
                }
                img.onerror = function () {
                    if (cfg.errorImg)
                        _ts.imgList[this.i] = this.src = cfg.errorImg;
                    _ts.$emit('error', {
                        source: 'img',
                        target: this
                    });
                }
                if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
                    img.setAttribute('data-src', img.src);
                    img.removeAttribute('src');
                    this._observer.observe(img);
                }
            }
            // 链接处理
            var links = this.rtf.getElementsByTagName('a');
            for (var link of links) {
                link.onclick = function (e) {
                    e.stopPropagation();
                    var jump = true,
                        href = this.getAttribute('href');
                    _ts.$emit('linkpress', {
                        href,
                        ignore: () => jump = false
                    });
                    if (jump && href) {
                        if (href[0] == '#') {
                            if (_ts.useAnchor) {
                                _ts.navigateTo({
                                    id: href.substr(1)
                                })
                            }
                        } else if (href.indexOf('http') == 0 || href.indexOf('//') == 0)
                            return true;
                        else
                            uni.navigateTo({
                                url: href
                            })
                    }
                    return false;
                }
            }
            // 视频处理
            var videos = this.rtf.getElementsByTagName('video');
            _ts.videoContexts = videos;
            for (let video, i = 0; video = videos[i++];) {
                fill(video);
                video.style.maxWidth = '100%';
                video.onerror = function () {
                    _ts.$emit('error', {
                        source: 'video',
                        target: this
                    });
                }
                video.onplay = function () {
                    if (_ts.autopause)
                        for (let item, i = 0; item = _ts.videoContexts[i++];)
                            if (item != this) item.pause();
                }
            }
            // 音频处理
            var audios = this.rtf.getElementsByTagName('audio');
            for (var audio of audios) {
                fill(audio);
                audio.onerror = function () {
                    _ts.$emit('error', {
                        source: 'audio',
                        target: this
                    });
                }
            }
            // 表格处理
            if (this.autoscroll) {
                var tables = this.rtf.getElementsByTagName('table');
                for (var table of tables) {
                    let div = document.createElement('div');
                    div.style.overflow = 'scroll';
                    table.parentNode.replaceChild(div, table);
                    div.appendChild(table);
                }
            }
            if (!append) this.document.appendChild(this.rtf);
            this.$nextTick(() => {
                this.nodes = [1];
                this.$emit('load');
            });
            setTimeout(() => this.showAm = '', 500);
            // #endif
            // #ifndef APP-PLUS-NVUE
            // #ifndef H5 || MP-360
            var nodes;
            if (!html) return this.nodes = [];
            var parser = new Parser(html, this);
            // 缓存读取
            if (this.useCache) {
                var hashVal = hash(html);
                if (cache[hashVal])
                    nodes = cache[hashVal];
                else {
                    nodes = parser.parse();
                    cache[hashVal] = nodes;
                }
            } else nodes = parser.parse();
            this.$emit('parse', nodes);
            if (append) this.nodes = this.nodes.concat(nodes);
            else this.nodes = nodes;
            if (nodes.length && nodes.title && this.autosetTitle)
                uni.setNavigationBarTitle({
                    title: nodes.title
                })
            if (this.imgList) this.imgList.length = 0;
            this.videoContexts = [];
            this.$nextTick(() => {
                (function f(cs) {
                    for (var i = cs.length; i--;) {
                        if (cs[i].top) {
                            cs[i].controls = [];
                            cs[i].init();
                            f(cs[i].$children);
                        }
                    }
                })(this.$children)
                this.$emit('load');
            })
            // #endif
            var height;
            clearInterval(this._timer);
            this._timer = setInterval(() => {
                // #ifdef H5 || MP-360
                this.rect = this.rtf.getBoundingClientRect();
                // #endif
                // #ifndef H5 || MP-360
                uni.createSelectorQuery().in(this)
                    .select('#_top').boundingClientRect().exec(res => {
                    if (!res) return;
                    this.rect = res[0];
                    // #endif
                    if (this.rect.height == height) {
                        this.$emit('ready', this.rect)
                        clearInterval(this._timer);
                    }
                    height = this.rect.height;
                    // #ifndef H5 || MP-360
                });
                // #endif
            }, 350);
            if (this.showWithAnimation && !append) this.showAm = 'animation:_show .5s';
            // #endif
        },
        // 获取文本内容
        getText(ns = this.nodes) {
            var txt = '';
            // #ifdef APP-PLUS-NVUE
            txt = this._text;
            // #endif
            // #ifdef H5 || MP-360
            txt = this.rtf.innerText;
            // #endif
            // #ifndef H5 || APP-PLUS-NVUE || MP-360
            for (var i = 0, n; n = ns[i++];) {
                if (n.type == 'text') txt += n.text.replace(/&nbsp;/g, '\u00A0').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
                    .replace(/&amp;/g, '&');
                else if (n.type == 'br') txt += '\n';
                else {
                    // 块级标签前后加换行
                    var block = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n.name[1] >
                        '0' && n.name[1] < '7');
                    if (block && txt && txt[txt.length - 1] != '\n') txt += '\n';
                    if (n.children) txt += this.getText(n.children);
                    if (block && txt[txt.length - 1] != '\n') txt += '\n';
                    else if (n.name == 'td' || n.name == 'th') txt += '\t';
                }
            }
            // #endif
            return txt;
        },
        // 锚点跳转
        in(obj) {
            if (obj.page && obj.selector && obj.scrollTop) this._in = obj;
        },
        navigateTo(obj) {
            if (!this.useAnchor) return obj.fail && obj.fail('Anchor is disabled');
            // #ifdef APP-PLUS-NVUE
            if (!obj.id)
                weexDom.scrollToElement(this.$refs.web);
            else
                this.$refs.web.evalJs('var pos=document.getElementById("' + obj.id +
                    '");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' + (obj.offset || 0) + '})');
            obj.success && obj.success();
            // #endif
            // #ifndef APP-PLUS-NVUE
            var d = ' ';
            // #ifdef MP-WEIXIN || MP-QQ || MP-TOUTIAO
            d = '>>>';
            // #endif
            var selector = uni.createSelectorQuery().in(this._in ? this._in.page : this).select((this._in ? this._in.selector :
                '#_top') + (obj.id ? `${d}#${obj.id},${this._in ? this._in.selector : '#_top'}${d}.${obj.id}` : '')).boundingClientRect();
            if (this._in) selector.select(this._in.selector).scrollOffset().select(this._in.selector).boundingClientRect();
            else selector.selectViewport().scrollOffset();
            selector.exec(res => {
                if (!res[0]) return obj.fail && obj.fail('Label not found')
                var scrollTop = res[1].scrollTop + res[0].top - (res[2] ? res[2].top : 0) + (obj.offset || 0);
                if (this._in) this._in.page[this._in.scrollTop] = scrollTop;
                else uni.pageScrollTo({
                    scrollTop,
                    duration: 300
                })
                obj.success && obj.success();
            })
            // #endif
        },
        // 获取视频对象
        getVideoContext(id) {
            // #ifndef APP-PLUS-NVUE
            if (!id) return this.videoContexts;
            else
                for (var i = this.videoContexts.length; i--;)
                    if (this.videoContexts[i].id == id) return this.videoContexts[i];
            // #endif
        },
        // #ifdef H5 || APP-PLUS-NVUE || MP-360
        _handleHtml(html, append) {
            if (!append) {
                // 处理 tag-style 和 userAgentStyles
                var style = '<style>@keyframes _show{0%{opacity:0}100%{opacity:1}}img{max-width:100%}';
                for (var item in cfg.userAgentStyles)
                    style += `${item}{${cfg.userAgentStyles[item]}}`;
                for (item in this.tagStyle)
                    style += `${item}{${this.tagStyle[item]}}`;
                style += '</style>';
                html = style + html;
            }
            // 处理 rpx
            if (html.includes('rpx'))
                html = html.replace(/[0-9.]+\s*rpx/g, $ => (parseFloat($) * windowWidth / 750) + 'px');
            return html;
        },
        // #endif
        // #ifdef APP-PLUS-NVUE
        _message(e) {
            // 接收 web-view 消息
            var d = e.detail.data[0];
            switch (d.action) {
                case 'load':
                    this.$emit('load');
                    this.height = d.height;
                    this._text = d.text;
                    break;
                case 'getTitle':
                    if (this.autosetTitle)
                        uni.setNavigationBarTitle({
                            title: d.title
                        })
                    break;
                case 'getImgList':
                    this.imgList.length = 0;
                    for (var i = d.imgList.length; i--;)
                        this.imgList.setItem(i, d.imgList[i]);
                    break;
                case 'preview':
                    var preview = true;
                    d.img.ignore = () => preview = false;
                    this.$emit('imgtap', d.img);
                    if (preview)
                        uni.previewImage({
                            current: d.img.i,
                            urls: this.imgList
                        })
                    break;
                case 'linkpress':
                    var jump = true,
                        href = d.href;
                    this.$emit('linkpress', {
                        href,
                        ignore: () => jump = false
                    })
                    if (jump && href) {
                        if (href[0] == '#') {
                            if (this.useAnchor)
                                weexDom.scrollToElement(this.$refs.web, {
                                    offset: d.offset
                                })
                        } else if (href.includes('://'))
                            plus.runtime.openWeb(href);
                        else
                            uni.navigateTo({
                                url: href
                            })
                    }
                    break;
                case 'error':
                    if (d.source == 'img' && cfg.errorImg)
                        this.imgList.setItem(d.target.i, cfg.errorImg);
                    this.$emit('error', {
                        source: d.source,
                        target: d.target
                    })
                    break;
                case 'ready':
                    this.height = d.height;
                    if (d.ready) uni.createSelectorQuery().in(this).select('#_top').boundingClientRect().exec(res => {
                        this.rect = res[0];
                        this.$emit('ready', res[0]);
                    })
                    break;
                case 'click':
                    this.$emit('click');
                    this.$emit('tap');
            }
        },
        // #endif
    }
}
</script>

<style>
@keyframes _show {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

/* #ifdef MP-WEIXIN */
:host {
    display: block;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* #endif */
</style>
